Earbud



FIG. 1 is a front, right side, and top perspective view of an earbud showing the new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a right side elevation thereof;

FIG. 5 is a left side elevation thereof;

FIG. 6 is a top plan thereof; and,

FIG. 7 is a bottom plan thereof.

The broken lines illustrate portions of the earbud and form no part of the claimed design. 

CLAIM The ornamental design for an earbud, as shown and described. 